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To ALL WHOM IT M AY oorciiiari:l i

Beit known' that I,`,ALI'11E'D DE PINDRAY, of Paris, France, have invented a new and' improved Smoke Consuming Furnacej'and I do hereby `'declare that the vfollowing is a full, clear, andcxact description thereof, which will enable others skilled in the art to makeand usethe same, reference being .had to the accompanying drawings, forming-part of" this specication.' i

This invention relates to an improved smoke-consuming furnace, whereby fuel isec'onomized and the construction of the furnace simplied. I

The invention consists essentially of three parts: first, in the form4 and arrangement of the're-boxv and furnace-walls invirelation to the boiler; second, in giving inclined concave form to the rear end of said tirebox; and, third, inthe form and'disposition of the'ire-bars. v

VThe boiler is disposed in the frnace in suche, manner that the walls of the latter, which I prefer making of fire-brick, surround,the boiler-cylinders, leavinga space of about two and three-quarter inchesall aroimd, except above, where the walls close'upon the.boiler-cyl inders, and except below, at the ledge or door', between whichand the cylinders there should be a-,sipaceof about'four inches, this space being required tosecure the full benefit of `radiation. I i I i 4The {ire-box is ;dispo sed` in front between thevertical walls ofthe furnace, the distance betweensaid walls being less than thc .widthof-thefboilen These lwalls rise to within the saine distance ofthe boiler as the curved walls, viz, about two and three-quarter inch'esLwith which latter they connectby a shoulder. The rear end of the ash-pit connects with'the floor of the bricked portion of the furnaceor flue by a curved incline, whereby the return-dranght, which I have found interferes greatly with th-e draughtof the chimney in ordinary furnaces, is'preventedv i 'y 'I' vfurnace-I )ars will be best understood by'reference to theplates of drawingsaccompaqying the speciiis cation, and are applicable to any sort of furnace. v I i I n'ow proceed to describe onelnode of application ofl my system, but ain by no means tolte understood as` -conining myself to the form'of boiler now about to be described, but, on the contrary, 'expresslydeclare that' my system' of` furnace -is applicable to many liinds o f boilers. In the present instance, in the accompanying plates of drawings-- 'A A i i Figure 1 is a vertical transverse section, and

Figure 2 a vertical longitudinals'ection of my improved furnace. v

Figures 3, 4, and 5 area side elevation, end view, and plan, respectively, ot` my improve'd furnace-bars. Similar letters 'of reference indicate` corresponding.` parts. 4 y i F, in the drawings, which, Iin the present instance,'represent a boiler o f two tubes, is the furnace, built .by preference of hre-brick. The distance, A A', between the two vertical walls-,of the furnace is equal to the distance between the centres ofthe two ,tubes When the boiler consists ef a single cylinder, the distance A Ai is to be'from sixand a quarter to six and a half inches narrower (little more or less) than the diameter of the cylinder, the longitudinalaxs whereof should 'lie in the central vertical plane :c x'. 'The vertical walls of the furnace rise from the base of the ash-pit Bftill within two and three-quarter 4inches (little more or less)` of the cylinders T. The furnace-walls then pass round the tubes, blocking tliemin, as seen atff, except where they communicate, as at G,'ivith any otherpart of theboiler, as H. This distance o'f two and three-quarter inches isto be observed, except where the wallsclose upon'the tubes at f, .until the lower portion or' ledge C is' approached, wherethe distance is -to be increased to nearly four inc hes,- the increase being necessary to secure the full benefit-of tife radiation. The ledge C ljoins the nsh-pit by the curve K, thus preventing the return of the aif,`vvl1ich,lin ordinary furnaces, after striking against thcrear wall, is thrown back, seriously interfering i with the draught-,of the'chimney. The'width of the fire-box, being taken as above, and the-nuniber of.horsepower given, the length of the irebox iscalculated by taking a gratesurface of nine and eighty-ive hundredths' inches, 4squared per herne-power.l

The bars D,`"shown' separately in figs. 3, 4, and`5, are Iixcd sloping down towards the back ofthe fire-bridge. This slope varies according 4to the length of the furnace, asv shown. The rear end of the bars should be four and three-quarter inches below the level of the front in gratos fourteen inches in length, and six inches below the like level in gratas of greater length. The length of the bers should he sullicient to extend from front 1o rear of the fire-box.l They should by preference be constructed of one piece, the depth varying as follows: Bars between fourteen and twenty-two inehesin length should. have their greatest depth eight and three-quarter inches; for hars from twenty-two to thirty-nine inches in length, the greatest depth should-bo eleven and a halt' inches; and for bars up to {ivc feet in length, the greatest depth should be thirteen inches. l The thickness of ,the hars varies from seven-sixteenths to thirteen-sixteenths of an inch, the variation being dependent on the draught and consumption of fuel required. The distenee between the bars will be regulated according lto the fuel intended to be used. Each bar is -provided with'a rib er projection, d, on one or both of its sides.

Thisspeeial form of bnr, combined with the inclined curved form of the rear end of the fire-bridge, forms a soit of funnel-shaped air-channel, and directs the draught of air through the burning fuel into the lower part of the grate, producing a. temperature suiliciont to burn the uneonsumed carbon of the smoke, and the gases arising from the fresh Acoal fed te the furnace.

Having thus described my invention, what I claim as new, and desire to secure by Letters Potent, is-

1. A furnace; so constructed that the walls surround the boiler and leave spacesJ in manner substantially as specified, and having the fire-bok disposed between vertical walls of said furnace, and of the relative dimen sions, and in manner substantially as shown and described.

2. The'inclined eoncavewall K,`connecting theJloor of the ash-pit with the loor of the flue, at -the rear end of the ash-pit, substantially as set forth and described.

Intestiinony whereof, I have signed my name to this specification before two subscribing witnesses.

ALFRED DE PINDRAY.

Witnesses:

EDWARD Teelt, C. Mnns. 

